Did NASA Delete Possible UFO Evidence From Its Archives?

Is NASA covering its tracks in regards to images that could reveal what is truly out there? Or simply reorganizing its archives of photos of space trash? io9 writes:

UFOlogists are freaking out today over the removal of several photos from a NASA archive. These photos [see right] have been used by various UFO groups to support their belief that aliens have been visiting Earth and governments are covering it up. NASA identifies these as images of “space debris.”

Believers say the removal of the photos is tantamount to admitting that NASA is trying to cover up extraterrestrial visitors. More likely is that they were removed after the space agency realized that they were fueling alien conspiracy theories.